2The mouth, nostrils, and eyes 1. Nictictating membrane-Protects eyes (similar to an eyelid)2.Tympanic membrane – the ear drumCollects sound wavesAllows frogs to hear in water2
3Examine the Mouth 1. Maxillary Teeth – (along inner edge of upper jaw) 3. Vomerine Teeth – (roof of mouth)Teeth are used to hold onto caught prey, do not use them to chew, they swallow prey whole!!6. Opening to Eustachian tubes2. internal Nares8 Glottis
410.Internal Nares –internal nostril openings on either side of the vomerine teeth. 11.Eustachian tube openings –connenct mouth cavity and the tympanic membraneHelp to equalize internal ear pressureIf the frog is male, these are near the openings to the vocal sacs which allow male frogs to make sounds50.Vomerine teeth
5Internal Structure -Female 31.Eggs32.Oviduct – tubes which carry the eggs after they have been made
622 – Eggs 18 – Liver – 9- Stomach 6 – Ventricle of heart 3 lobed structure that produces bile for lipid digestion and starchFood does not pass through, but blood doesStill considered as part of digestive system9- Stomach6 – Ventricle of heart12 – small intestine
819 – Pericardium – membrane that surrounds the heart.
9Heart – Circulatory System 1. Ventricle 2. Right atrium 3. Left atrium 4. Sinus venosusTriangular sac underneath the heart Veins from all over the body empty here before going into the right atriumPart of circulatory system
10The Lungs Lungs 2 sac like structures on either side of the heart Collect oxygen from air and transfer it to blood supplyPart of respiratory system
12Digestive system 16.Small intestine 17.Liver - 18.Large intestine At lower end of the stomachBreaks soupy mixture from stomach into usable nutrients using bile from liver and enzymes from the pancreas17.Liver -18.Large intestineCollects waste from tissues and wastes that could not be absorbed by the small intestine.19.Stomach – secretes digestive juices to break down whole food swallowed by the frog into a soupy mixture
1326.Spleen –filters improperly functioning blood cells; circulatory system 29.Teste
1410 – pancreas Secretes enzymes into small intestine
1711- Pylorus- muscular valve between the stomach and small intestine
1823 – Kidney Located in either side of the spine, near the dorsal side; filter blood and urine that drains into the urinary bladder; excretory system
1923 & 24 Kidneys21 – Fat Bodies27 – Urinary Bladderurine travels from the kidneys, down tubes called ureters to this bladder where it is stored until emptied through the cloaca.
2021 – Fat Bodies 22-Testes 23 & 24 Kidneys Attached near kidneys Store fat for nourishment for the gametesMuch larger and more abundant in females22-TestesSmall, oval structure underneath kidneysSperm travels through the kidneys, down the ureters and out the cloaca.23 & 24 Kidneys